Terahertz emission driven by two-color laser pulses at various frequency ratios

Wang, Weimin; Sheng, Zheng-Ming; Li, Y.-T; Zhang, Y.; Zhang, J.

doi:10.1103/physreva.96.023844

Cited by 28 publications

(12 citation statements)

References 49 publications

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“…Such a laser field cannot generate more spin-up or spin-down electrons via nonlinear Compton scattering, as observed in Fig. 2(h vector potential [33,34] and radiation reaction [55]. Besides, it is shown in Figs.…”

Section: B Electron Polarization Via Radiative Spin Effectsmentioning

confidence: 90%

“…One can notice in Figs. 2(f) and (g) that the electrons can acquire a non-zero drift velocity in a such field configuration due to asymmetry in the laser vector potential [33,34] and radiation reaction [55]. Besides, it is shown in Figs.…”

Section: B Electron Polarization Via Radiative Spin Effectsmentioning

confidence: 94%

“…In other words, asymmetric laser fields may result in a considerable polarization. The well-known asymmetric two-color laser configuration has been widely adopted in generation of Terahertz radiation [31][32][33][34], high harmonic wave generation [35,36], and laser wakefield acceleration [37]. Recently, it is also proposed to generate polarized positron beams through multiphoton Breit-Wheeler pair production [38].…”

Section: Introductionmentioning

confidence: 99%

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Spin-polarization effects of an ultrarelativistic electron beam in an ultraintense two-color laser pulse

Song

Wang

et al. 2019

Phys. Rev. A

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Spin-polarization effects of an ultrarelativistic electron beam head-on colliding with an ultraintense two-color laser pulse are investigated comprehensively in the quantum radiation-dominated regime. We employ a Monte Carlo method, derived from the recent work of [Phys. Rev. Lett. 122, 154801 (2019)], to calculate the spinresolved electron dynamics and photon emissions in the local constant field approximation. We find that electron radiation probabilities in adjacent half cycles of a two-color laser field are substantially asymmetric due to the asymmetric field strengths, and consequently, after interaction the electron beam can obtain a total polarization of about 11% and a partial polarization of up to about 63% because of radiative spin effects, with currently achievable laser facilities, which may be utilized in high-energy physics and nuclear physics. Moreover, the considered effects are shown to be crucially determined by the relative phase of the two-color laser field and robust with respect to other laser and electron beam parameters.

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Section: B Electron Polarization Via Radiative Spin Effectsmentioning

confidence: 90%

Section: B Electron Polarization Via Radiative Spin Effectsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Spin-polarization effects of an ultrarelativistic electron beam in an ultraintense two-color laser pulse

Song

Wang

et al. 2019

Phys. Rev. A

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“…More recently, the advent of sub-mJ, ultrafast mid-IR (3.9 µm) and CO 2 (10.6 µm) lasers inspired both numerical [24,25] and experimental [26,27] investigations confirming the increase in the conversion efficiency over 1 − 2 % and ∼ 0.1 mJ energies for pump energies < 10 mJ. Alternative methods for increasing the THz yield may also rely on an optimum tuning of the intensity level versus the ionized gas (e.g., Ar, He) and their successive electron shells [28], playing on the pump pulse duration or reducing the plasma dimensions [29][30][31], increasing the number of colors [32][33][34] or even modifying the frequency ratio between the two colors [35,36]. Combining these techniques can then be expected to augment the THz pulse energy by at least one order of magnitude.…”

Section: Introductionmentioning

confidence: 99%

Terahertz pulse generation by two-color laser fields with circular polarization

Tailliez,

Stathopulos,

Skupin

et al. 2020

Preprint

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We study the influence of the polarization states of femtosecond twocolor pulses ionizing gases on the emitted terahertz radiation. A local-current model and plane-wave evaluations justify the previously-reported impact on the THz energy yield and an (almost) linearly-polarized THz field when using circularly-polarized laser harmonics. For such pump pulses, the THz yield is independent on the relative phase between the two colors. When the pump pulses have same helicity, the increase in the THz yield is associated to longer ionization sequences and higher electron transverse momenta acquired in the driving field. Reversely, for two color pulses with opposite helicity, the dramatic loss of THz power comes from destructive interferences driven by the highly symmetric response of the photocurrents lined up on the third harmonic of the fundamental pulse. While our experiments confirm an increased THz yield for circularly polarized pumps of same helicity, surprisingly, the emitted THz radiation is not linearly-polarized. This effect is explained by means of comprehensive 3D numerical simulations highlighting the role of the spatial alignment and non-collinear propagation of the two colors.

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“…In the calculation, they have utilized the conventional laser pulse of 800 nm as a fundamental pulse, and a laser pulse of 1600, 1200, or 533 nm as the second pulse to generate THz radiation, which is virtually as effective as the commonly used laser with a wavelength of 400 nm. [25] Then, the study by Wang et al shows that more frequency ratios can be used to generate the stable THz radiation, [26] and they further presented the first experimental demonstration of THz generation with the uncommon frequency ratios. [27] In their experiment, the combination of 400-nm and 1600-nm pulses and the combination of 800-and 1200-nm pulses were used to generate the intense THz pulse.…”

Section: Introductionmentioning

confidence: 99%

Enhancement and modulation of terahertz radiation by multi-color laser pulses

Pei

Wang

et al. 2018

Chinese Phys. B

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We study theoretically intense terahertz radiation from multi-color laser pulse with uncommon frequency ratios. Comparing the two-color laser scheme, of which the uncommon frequency ratio should be set to be a specific value, we show that by using multi-color harmonic laser pulses as the first pump component, the lasers as the second pump component can be adjusted in a continuous frequency range. Moreover, these multi-color laser pulses can effectively modulate and enhance the terahertz radiation, and the terahertz yield increases with the increase of the wavelength of the uncommon pump component and is stable to the laser relative phase. Finally, we utilize the electron densities and velocities of ionization events to illustrate the physical mechanism of the intense terahertz generation.

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Terahertz emission driven by two-color laser pulses at various frequency ratios

Cited by 28 publications

References 49 publications

Spin-polarization effects of an ultrarelativistic electron beam in an ultraintense two-color laser pulse

Spin-polarization effects of an ultrarelativistic electron beam in an ultraintense two-color laser pulse

Terahertz pulse generation by two-color laser fields with circular polarization

Enhancement and modulation of terahertz radiation by multi-color laser pulses

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